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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed84c3b7a70db8cefaf471843fde4786e336dc4fb50e2c820b10c4f240a2b56' 
  AND token = 'bE2ZAA4cna61mS9cp0HXQ56Jd3hcjWAWzYZ0fYyLPks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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