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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd29d4fd120a143ae85bf39e428e6c577d0340f69e98af9c2f1b1c1b1796c08d' 
  AND token = 'Jx1Hdp+SyQbmkHkxcRtyoz1yR+asV2skQK4JWwQ7KvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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