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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3fe3a9f4c9520741bd8183592117dfcd42c638902f3bf513249fccd0adc039' 
  AND token = 'NENG+AFOBoKjIVATEMiKbOZWatlyWnLdhTapy6M/gJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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