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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393d830454359d1d061b7a4da0e965221b98941d07dc6a1de5ed9096621cfb1e' 
  AND token = 'HbCu4dJ9Yp/FAx34bB8AusQ7sLIQ1q5mNrP7r4ZHgkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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