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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5baebce065b22989e857e204bf59ea504462049363f257351ee896b2f3e65f3b' 
  AND token = 'I6/sUuqDuM+pkMuHCCYOE/aheI7w9cTSK4zv++DEmeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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