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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad4dc080a8d6368be56cae74497a6b5092c66f0665533c604bbe6e1e7ae87a9' 
  AND token = 'GeHdYwMZuTH5fZfh9Joq7Xo6xjxlhdnFuxbMIkvX6rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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