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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371d94ed199165161d2c08609c5944f792cecc970dd699ad9d52f0a7f631f00b' 
  AND token = '4KH3OrTazLFw4FbBJCUJAYFAWimvS7T0zjJSdMkC0ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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