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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3744ca85c310cf59f27c7ced874d16cfad96890d07834e403b35dc18644109c3' 
  AND token = 'tex2rKeDz6FmZGh/nSMKxMAa1MywaQPl0OOmFGfhwZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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