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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5612f5eec76a56dd03d2911abf86431da70bfdedd397fb28c1f77cb66f0b2e' 
  AND token = 'J5hHGst/BVh79wPJHEbUljryQ2F2EpLPkBxVbGL4NFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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