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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7a6c396b235b108193861a2112857e8b31ffd9a14ec473718fa0e42d312259' 
  AND token = 'JbfQxyaNVHeYusQtksAWmSHVQ1JV5MzDsCUIyAjsg0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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