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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07b73bfc4bbb9ab80d78e4bfe35ab3aa9567934c41fa4a20e67857025e849cc' 
  AND token = '7geMteR+2b9qo9wpBVU/L2Fs7gbibh3A6bVTJaaG/Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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