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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8743d943f12fc35c65d504fdc18b0cfe26c65e7119f6e2d3aac03cb761e9c804' 
  AND token = 'oYAONPZH85+fyUFoMLcdq+NYtJ6puPxFpxWjeohJmPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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