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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4d27e3782f8f448f9ddc05582565ca8939818d012fc1ebc0c15b3cf22977c4' 
  AND token = 'ypMA57z0QofijsZgQvhdDvyqW7dnN/v219o0UG75l/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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