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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff325a24b770f45a03e330cee092000757043816288d9b372acdd43ad8a494c' 
  AND token = '+EscleT9vmGkX0GGb4bvlnuyty8+2GHpMBNsBk1+Nhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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