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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604b4124606acf8791070d3d7e8b35278a56dddfd5756438236685e1af2d263b' 
  AND token = 'AGf8r9g5jYLTu/k5a2o/vUrXn76UBxsatPp6R0YInh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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