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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c78a39efe48d0b54b635531a42370c81a47b02963712c7c823189c3aedc667' 
  AND token = 'YfyyEzK3Si6ZVAIR6LskraFkAL/EYOxrWHm2+RVPPD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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