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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27da1e377d74bf3856870536586b476141f7cc968c6b9261ebe05ca93586fe3' 
  AND token = 'MZn+gU7V5XTkcJXAkZPhXMO2hAdclS8bLDPXSBtkT6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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