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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d6a04157215ef6fed546aaa70104f948e2eb24aef0426bd2fbf9fbd679a783' 
  AND token = '8M59VzmCsVAWuSLL7gG1K1NgQ7u+Bkmq3Wy/CCm9q58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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