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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacdac8acc2f2b3cf06d38861b05245cdbd91f80a07b950407919eaaded75bc9' 
  AND token = 'x8OUVuL6lrGYzxOJXIUO2qOm+alH40JnKpOXE3N0F7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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