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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e0f05748f962c8ee441430dc43a8a26de947a61067ecd7faee1195ab76e0c0' 
  AND token = 'wxE7HPxyV7hTO1ZA2XkleayGzEPXGzbArP7eEslqYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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