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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0fb5a98f83618e2026c91fb514a3e3204e213648a9d689547a9a3c1bb7c338' 
  AND token = 'pSnzexSb1HMxy7sTZiPmXUoXSrxo75aZHbVa07Wyh7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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