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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fad19a5ec4034a89ecc142818b5cf730e110ca6a6b40dcc7b8a8879ae51ca35' 
  AND token = 'NVPxndJgeRXzZIPMg7B033nI6DYiYpipS2s7/BsWxb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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