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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696c1e6e5b7689a68d2aeb163a80f67e2ad2f0235b26fb45991a626e26534d4f' 
  AND token = '+bmIn/Yf9ZbPrkuyNp9vvEa1yjVhH1eBMiUIgAPRW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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