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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd065271503852f1306571a5a6725b25aac6652e0ad3dc89eed0e4b8e6c31d3a2' 
  AND token = 'QLv8g/cFR6wUdLsI2mYsHstkil/nxAXEbSNgBuDjceA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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