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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1797ae499a55e18de6e26f845eeeca40e18f70005a1c4424fc8900ce63c3c568' 
  AND token = 'bxKEgPdoZZD/aamnV6fCdR5eYmK6OSsf74xR+vyHB+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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