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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba251936bb1edaff207f9e17419d5a2b5fec01500960708c7b3200e00bd5130' 
  AND token = 'YWsDQAlcJQO0Fn8MmFRUK4Q3sYDFLWoYvrotJ2BQ4JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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