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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6004bd5d501a59d9e2a8960f9070d5e3b06af4764ace8289b98b0f0206aad6b' 
  AND token = 'uk31Fq1oUFgMFot59Kadpuur1YXgxBVNCZRzKwk7fI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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