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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e959402d1d36f53dc73712ced8d244c9bc5382f30ecd3b8b2438d275997d7648' 
  AND token = '3khXxQoLgEuQhaoXmHe5oeg5Fc/5jvn9EqD94mifwdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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