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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70af637fae9ed0d0374730c10b7f6a167c903d8578a09573f29fc3b006fd203c' 
  AND token = 'm1e82r5A73EwvRnJHeiF7NKYFk/Df88C51Vgm83JVeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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