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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b719b6cf75fdaadffdc224437b66a226d8205334baa05eeb65ab24de2b9e2b9' 
  AND token = 'EJq0tvfBWb8UgGnxQmGnzu66Ib8pig+IX693Yb9mxKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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