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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f023cac39f00f96aa2ddca63051536ec4fbe9ac5ae615453e508a55502b8af5a' 
  AND token = 'GR8sVoqiRPDap69+OoEqOdYVFTbtfwnWeoHTs8i7jSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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