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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666cc3c67c20cb04388cbb888ced185e0809780570e9ea42abf571d50851626c' 
  AND token = 'pOV4uGDFYQ2+oGET97DAH+D2woANiWphLJ1zFocl3dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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