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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e599bdeafffe9fe6366d60869762b103993a3fc3e1362061affb459ef532f7' 
  AND token = '/delMWJxhfEZ9YjpUjFhi4b9mAk4sf9470+fqJfWX2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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