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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e304753a257f79374aa6f12b9aba20d9a99e9b8ca3e7078df984d235263f0eaf' 
  AND token = '3NVPoAtcTmcm6GrEMxW+YMQmE7c6uEWJ9pZPrricxDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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