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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9579fac7805daee110e41bb45e0c7c4a6b344dfee12114bb5d9a50cdb675dd8f' 
  AND token = 'Yv0/dqRtRmHj1qQZRekteQ1EPOCL8u79gV3YSJMHfB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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