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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f562a91d654f03ed3c760e7556974104623c0529b941bcb106c2cc115d0d7a' 
  AND token = 'OagMh3pcmyuyI/nYRUJSyIN46Ow1rZT0fWa+r28ajYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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