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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00883cb001b94d8e6ee7355c56c6364d0da1887e80e4e8e829766dcd21ef23f2' 
  AND token = 'KBpnYufb67WcM6/yKVdssJmHcj6detT8buMPo0HMw9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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