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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd6a629d2678e408ab5a42ed37a5584b4419013358f708d0a610929f458480' 
  AND token = 'lIrM9fh6j5T6Hk1pw3Aml4OBEqc4xLIVHSYjleP2vJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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