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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd328626ef7248a83a5b169b8399e582932ea4c7b9c749f01199c6ef289e2288' 
  AND token = '9U7kpPo7C/yRpGzsco9+F8bA2VqCkZVnqe03c71jR+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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