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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ce70dae21fd84b996af7230655f02e3149c5984ceeee768af81e80a8f0e64f' 
  AND token = 'M8gRT0oe6LNOa7JBiXjz8WvaEZ383I9xZFXiViadotM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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