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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3159a52e844f58be83537d54461b47614bf3e5e23faa55c1bf8a4adbd94f70ee' 
  AND token = 'ujnjotl60qiCDWjFbwC7sAAM+4kE2G0BMA2iudTLs60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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