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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38887db3e84aaa2a75929eaa8f8889f2e20b0d0f2d8a4c9848fd89cd79f7622f' 
  AND token = 'qSvkmbIxxVJYcNz36RenCfv1TMU5rVeWMhrI5sA3qxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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