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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ae6d71ea02aa5a6f1d8685f0e9b6b35478ba03e12026db310950b67691efec' 
  AND token = 'knz1quiBLcTXtUJ2ahwVkooSKY9hq1+TAYFZl01Kbvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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