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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25d111a11c74b66ff98acc2ded5d439533d49144feebcd03f4e77f7c5d304ad' 
  AND token = '0uPnc1zNCj7R1M6J1AO9mRe/IgTDC7APmsO1pVVno+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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