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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca0ab3521acb17d3c1ba73ab805ad2e7903f6cf0e0f02077e4873933ebb5593' 
  AND token = 'fKYJFJZ4QT7dVn21uoooZN1B50oFHWPDxXoyx+Dqrps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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