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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5d783ea28fb50aca25288506b8ed577d8407ec346cf74afb3327125b62fc9b' 
  AND token = 'YYrxLkBc/v4HmWuwC57lMCrqXQf8XdAnYc1XFLszfSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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