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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7d8a9553caa025fe8e4afac98211aaf70931c5defd97a3f43597ccbb8625d1' 
  AND token = 'DDYmhnuJOlL4BSzm8G9K8odts88mW7qeGLdPhtlPLJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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