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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf92287b1a9da351ab031ea0c82034c7f25912dd58c32dbf40ebf0862860466' 
  AND token = 'MDfteUIWcQjtW4z5mJbR2R7kpNg8VpXCpjk3wISpYCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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