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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3670d8e0f50d795c08d0efd811af1e54275190c8864e0b855a86eff80311d4e8' 
  AND token = '3ukgHicbojxwye/BjLbBCvG7WnZjq9nPW6W8G2xIltc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}