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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6689ee0ebeff85338710ad1d2f8a5cadde6d151c133ae67775f527996ccd24' 
  AND token = '1T06+Z0/+UMBjACDAIMfry6gOkISCyTgkTv+sBEmnz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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