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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd696c95022e1f36f9de119bc3ec70cc85e13db376a12b36275fde77ccddce57a' 
  AND token = 'RcWWP80T8c4lc8DUxzPW2bIljQbUWI3Tatle41emTKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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